Yes, Even, I am facing the problem with this Geyser. I too went by the brandname. Though they rate it as 5 star, but, I found that according to indian ISI and other standard ratings it rates below 1 star. The product is worst if you have hard water supply. The thermostart won't work properly and also the heating element gets even worst. CG replaced both the elements and they came twice to do this job. First time they replaced Heating element and left without checking the Thermostat functionality. It is a common sense that any kid can tell, if Heating element is burnt out then Thermostat could not cut-off supply and they should had checked the performance of Thermostat. Again, I had to call them back, register a new complaint finally and got replaced Thermostat also.
Actually, to my understanding this Geyser never worked to its efficiency as promised from day one itself. But, I used to draw slow output for hot water (similar to what we do for instant water heaters). Then slowly these problems arised.
After doing all this, now after 2 months of post repair and warranty expired... now the reset button is tripping and I need to reset this button everytime once the water gets heated. Also, I dont think it is heating 15ltrs of water to its capacity.
I rate this product for CG Solarium plus as a JUNK. Go for Regency or Remson brand. If you get REGENCY then it is the best and also rated 5 star by ISI.